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How to Fix a Key Fob That isn't Working If your key fob isn't working A few easy steps can be taken to fix it. First, make sure that it's not the backup remote. If your backup remote can unlock and lock the doors of your car, it is most likely that the primary remote isn't working. The most common causes for car remote key failure are circuitry or battery issues. Battery The battery in the key fob could be worn out over time. It is fairly easy to change out the battery, however it is important to make sure that you use the right type that you can refer to your ow